fix: improve doc link navigation and tree display

- Fix link resolution with proper relative/absolute path handling
- Improve link styling with underline decoration
- Hide leaf nodes from tree, only show directories
- Fix log file path for packaged app

docs/api/rhi/d3d12/fence/fence.md

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+# D3D12Fence
+
+**命名空间**: `XCEngine::RHI`
+
+**描述**: DirectX 12 栅栏同步对象的 D3D12 实现，继承自 `RHIFence`。
+
+## 公共方法
+
+| 方法 | 描述 |
+|------|------|
+| [`Initialize`](../../../threading/task-system/initialize.md) | 初始化栅栏 |
+| [`Shutdown`](../../../threading/task-system/shutdown.md) | 关闭栅栏 |
+| [`Signal`](signal.md) | 信号栅栏 |
+| [`Wait`](../../../threading/task-group/wait.md) | 等待栅栏 |
+| [`GetCompletedValue`](get-completed-value.md) | 获取完成值 |
+| [`IsSignaled`](is-signaled.md) | 检查是否已信号 |
+| [`GetEventHandle`](get-event-handle.md) | 获取事件句柄 |
+| [`GetNativeHandle`](../../buffer/get-native-handle.md) | 获取原生句柄 |
+| [`GetFence`](get-fence.md) | 获取 D3D12 栅栏 |
+
+## 相关文档
+
+- [D3D12 后端总览](../../opengl/overview.md)
+- [RHIFence](../../fence/fence.md) - 抽象栅栏接口